| 8 | "0123456789+/"; |
| 9 | |
| 10 | char * |
| 11 | base64_encode(const unsigned char *input, int length) |
| 12 | { |
| 13 | /* http://www.adp-gmbh.ch/cpp/common/base64.html */ |
| 14 | int i=0, j, s=0; |
| 15 | unsigned char char_array_3[3], char_array_4[4]; |
| 16 | |
| 17 | int b64len = (length+2 - ((length+2)%3))*4/3; |
| 18 | char *b64str = new char[b64len + 1]; |
| 19 | |
| 20 | while (length--) { |
| 21 | char_array_3[i++] = *(input++); |
| 22 | if (i == 3) { |
| 23 | char_array_4[0] = (char_array_3[0] & 0xfc) >> 2; |
| 24 | char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4); |
| 25 | char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6); |
| 26 | char_array_4[3] = char_array_3[2] & 0x3f; |
| 27 | |
| 28 | for (i = 0; i < 4; i++) |
| 29 | b64str[s++] = base64_chars[char_array_4[i]]; |
| 30 | |
| 31 | i = 0; |
| 32 | } |
| 33 | } |
| 34 | if (i) { |
| 35 | for (j = i; j < 3; j++) |
| 36 | char_array_3[j] = '\0'; |
| 37 | |
| 38 | char_array_4[0] = (char_array_3[0] & 0xfc) >> 2; |
| 39 | char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4); |
| 40 | char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6); |
| 41 | char_array_4[3] = char_array_3[2] & 0x3f; |
| 42 | |
| 43 | for (j = 0; j < i + 1; j++) |
| 44 | b64str[s++] = base64_chars[char_array_4[j]]; |
| 45 | |
| 46 | while (i++ < 3) |
| 47 | b64str[s++] = '='; |
| 48 | } |
| 49 | b64str[b64len] = '\0'; |
| 50 | |
| 51 | return b64str; |
| 52 | } |
| 53 | |
| 54 | static inline bool is_base64(unsigned char c) { |
| 55 | return (isalnum(c) || (c == '+') || (c == '/')); |